Adsorption of 4He on Bare and on Argon-Coated Exfoliated Graphite at Low Temperatures
Measurements have been made of adsorption isotherms of 4He on bare, exfoliated graphite (Grafoil†1) and on the same substrate coated with a completed monolayer of argon. The isotherms were measured at 4.2, 6.18, 7.90, 9.65, 11.60, 13.50, 15.08, and 18.55°K in the pressure range 0.25–25 Torr using an apparatus which has been described previously. Thermomolecular pressure corrections were less than 3% even at the lowest temperatures and the accuracy of pressure measurement was within 0.5%. Details of the method of temperature and pressure measurement and of the corrections used in the calculations of the mass adsorbed have been given previously.2 3
KeywordsAdsorption Isotherm Isosteric Heat Exfoliate Graphite Themis Program Copper Post
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